Mark display parameter to be nullable am: d29698422c am: a21577e507 am: b0e479100d am: 52cb75563b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/18670795

Change-Id: Ie5a39f0dc7483d485a16af84b8a79c764d4f0318
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>